Issue pypa#2140: Build wheels automatically

Building wheels before installing elminates a cause of broken environments -
where install fails after we've already installed one or more packages.

If a package fails to wheel, we run setup.py install as normally.

docs/reference/pip_install.rst

@@ -18,6 +18,15 @@ Description
 
 .. _`Requirements File Format`:
 
+Overview
+++++++++
+
+Pip install has several stages:
+
+1. Resolve dependencies. What will be installed is determined here.
+2. Build wheels. All the dependencies that can be are built into wheels.
+3. Install the packages (and uninstall anything being upgraded/replaced).
+
 Installation Order
 ++++++++++++++++++
 
@@ -421,6 +430,10 @@ implement the following command::
 This should implement the complete process of installing the package in
 "editable" mode.
 
+All packages will be attempted to built into wheels::
+
+    setup.py bdist_wheel -d XXX
+
 One further ``setup.py`` command is invoked by ``pip install``::
 
     setup.py clean

pip/commands/install.py

@@ -9,7 +9,8 @@
 
 from pip.commands._utils import populate_requirement_set, BadOptions
 from pip.req import RequirementSet
-from pip.locations import build_prefix, virtualenv_no_global, distutils_scheme
+from pip.locations import (
+    build_prefix, virtualenv_no_global, distutils_scheme, WHEEL_CACHE_DIR)
 from pip.basecommand import Command
 from pip.index import PackageFinder
 from pip.exceptions import (
@@ -19,6 +20,7 @@
 from pip.utils import ensure_dir
 from pip.utils.build import BuildDirectory
 from pip.utils.deprecation import RemovedInPip7Warning, RemovedInPip8Warning
+from pip.wheel import WheelBuilder
 
 
 logger = logging.getLogger(__name__)
@@ -285,10 +287,13 @@ def run(self, options, args):
         with self._build_session(options) as session:
 
             finder = self._build_package_finder(options, index_urls, session)
-
             build_delete = (not (options.no_clean or options.build_dir))
             with BuildDirectory(options.build_dir,
                                 delete=build_delete) as build_dir:
+                if not options.cache_dir or options.download_dir:
+                    wheel_download_dir = None
+                else:
+                    wheel_download_dir = WHEEL_CACHE_DIR()
                 requirement_set = RequirementSet(
                     build_dir=build_dir,
                     src_dir=options.src_dir,
@@ -303,6 +308,7 @@ def run(self, options, args):
                     session=session,
                     pycompile=options.compile,
                     isolated=options.isolated_mode,
+                    wheel_download_dir=wheel_download_dir,
                 )
 
                 try:
@@ -314,7 +320,21 @@ def run(self, options, args):
 
                 try:
                     if not options.no_download:
-                        requirement_set.prepare_files(finder)
+                        if options.download_dir:
+                            # on -d don't do complex things like building
+                            # wheels.
+                            requirement_set.prepare_files(finder)
+                        else:
+                            # build wheels before install.
+                            wb = WheelBuilder(
+                                requirement_set,
+                                finder,
+                                build_options=[],
+                                global_options=[],
+                            )
+                            # Ignore the result: a failed wheel will be
+                            # installed from the sdist/vcs whatever.
+                            wb.build(autobuilding=True)
                     else:
                         # This is the only call site of locate_files. Nuke with
                         # fire.

pip/wheel.py

@@ -13,18 +13,22 @@
 import shutil
 import stat
 import sys
+import tempfile
 import warnings
 
 from base64 import urlsafe_b64encode
 from email.parser import Parser
 
 from pip._vendor.six import StringIO
 
+import pip
+from pip.download import path_to_url, unpack_url
 from pip.exceptions import InvalidWheelFilename, UnsupportedWheel
 from pip.locations import distutils_scheme
 from pip import pep425tags
 from pip.utils import (
-    call_subprocess, ensure_dir, make_path_relative, captured_stdout)
+    call_subprocess, ensure_dir, make_path_relative, captured_stdout,
+    rmtree)
 from pip.utils.logging import indent_log
 from pip._vendor.distlib.scripts import ScriptMaker
 from pip._vendor import pkg_resources
@@ -550,8 +554,25 @@ def __init__(self, requirement_set, finder, build_options=None,
         self.global_options = global_options or []
 
     def _build_one(self, req):
-        """Build one wheel."""
+        """Build one wheel.
 
+        :return: The filename of the built wheel, or None if the build failed.
+        """
+        tempd = tempfile.mkdtemp('pip-wheel-')
+        try:
+            if self.__build_one(req, tempd):
+                try:
+                    wheel_name = os.listdir(tempd)[0]
+                    wheel_path = os.path.join(self.wheel_dir, wheel_name)
+                    os.rename(os.path.join(tempd, wheel_name), wheel_path)
+                    return wheel_path
+                except:
+                    return None
+            return None
+        finally:
+            rmtree(tempd)
+
+    def __build_one(self, req, tempd):
         base_args = [
             sys.executable, '-c',
             "import setuptools;__file__=%r;"
@@ -561,7 +582,7 @@ def _build_one(self, req):
 
         logger.info('Running setup.py bdist_wheel for %s', req.name)
         logger.info('Destination directory: %s', self.wheel_dir)
-        wheel_args = base_args + ['bdist_wheel', '-d', self.wheel_dir] \
+        wheel_args = base_args + ['bdist_wheel', '-d', tempd] \
             + self.build_options
         try:
             call_subprocess(wheel_args, cwd=req.source_dir, show_stdout=False)
@@ -570,24 +591,30 @@ def _build_one(self, req):
             logger.error('Failed building wheel for %s', req.name)
             return False
 
-    def build(self):
-        """Build wheels."""
+    def build(self, autobuilding=True):
+        """Build wheels.
 
-        # unpack and constructs req set
+        :param unpack: If True, replace the sdist we built from the with the
+            newly built wheel, in preparation for installation.
+        :return: True if all the wheels built correctly.
+        """
+        # unpack sdists and constructs req set
         self.requirement_set.prepare_files(self.finder)
 
         reqset = self.requirement_set.requirements.values()
 
         buildset = []
         for req in reqset:
             if req.is_wheel:
-                logger.info(
-                    'Skipping %s, due to already being wheel.', req.name,
-                )
+                if autobuilding:
+                    logger.info(
+                        'Skipping %s, due to already being wheel.', req.name)
             elif req.editable:
                 logger.info(
-                    'Skipping %s, due to being editable', req.name,
-                )
+                    'Skipping bdist_wheel for %s, due to being editable',
+                    req.name)
+            elif autobuilding and not req.source_dir:
+                pass
             else:
                 buildset.append(req)
 
@@ -602,8 +629,27 @@ def build(self):
         with indent_log():
             build_success, build_failure = [], []
             for req in buildset:
-                if self._build_one(req):
+                wheel_file = self._build_one(req)
+                if wheel_file:
                     build_success.append(req)
+                    if autobuilding:
+                        # XXX: This is mildly duplicative with prepare_files,
+                        # but not close enough to pull out to a single common
+                        # method.
+                        # Delete the source we build the wheel from
+                        req.remove_temporary_source()
+                        # set the build directory again - name is known from
+                        # the work prepare_files did.
+                        req.source_dir = req.build_location(
+                            self.requirement_set.build_dir)
+                        # Update the link for this.
+                        req.link = pip.index.Link(
+                            path_to_url(wheel_file), trusted=True)
+                        assert req.link.is_wheel
+                        # extract the wheel into the dir
+                        unpack_url(
+                            req.link, req.source_dir, None, False,
+                            session=self.requirement_set.session)
                 else:
                     build_failure.append(req)
 

tests/data/packages/README.txt

@@ -104,4 +104,7 @@ requires_simple_extra-0.1-py2.py3-none-any.whl
 ----------------------------------------------
 requires_simple_extra[extra] requires simple==1.0
 
-
+requires_wheelbroken_upper
+--------------------------
+Requires wheelbroken and upper - used for testing implicit wheel building
+during install.

tests/data/packages/requires_wheelbroken_upper/setup.py

@@ -0,0 +1,5 @@
+import setuptools
+setuptools.setup(
+    name="requires_wheelbroken_upper",
+    version="0",
+    install_requires=['wheelbroken', 'upper'])

tests/functional/test_install.py

@@ -7,6 +7,7 @@
 
 import pytest
 
+from pip.locations import WHEEL_CACHE_DIR
 from pip.utils import rmtree
 from tests.lib import (pyversion, pyversion_tuple,
                        _create_test_package, _create_svn_repo, path_to_url)
@@ -748,3 +749,23 @@ def test_install_wheel_broken(script, data):
     res = script.pip(
         'install', '--no-index', '-f', data.find_links, 'wheelbroken')
     assert "Successfully installed wheelbroken-0.1" in str(res), str(res)
+
+
+def test_install_builds_wheels(script, data):
+    script.pip('install', 'wheel')
+    to_install = data.packages.join('requires_wheelbroken_upper')
+    res = script.pip(
+        'install', '--no-index', '-f', data.find_links,
+        to_install)
+    expected = ("Successfully installed requires-wheelbroken-upper-0"
+                " upper-2.0 wheelbroken-0.1")
+    # Must have installed it all
+    assert expected in str(res), str(res)
+    wheels = os.listdir(WHEEL_CACHE_DIR())
+    # and built wheels into the cache
+    assert wheels != [], str(res)
+    # and installed from the wheels
+    assert "Running setup.py install for upper" not in str(res), str(res)
+    assert "Running setup.py install for requires" not in str(res), str(res)
+    # wheelbroken has to run install
+    assert "Running setup.py install for wheelb" in str(res), str(res)